CAJ | 학술논문

利用X射线衍射(XRD)、傅里叶变换红外光谱(FT-IR)、零电荷点pHPZC、循环伏安(CV)和电化学阻抗(EIS)等手段，研究镁铁水滑石(MgFe-LDHs)的表面化学性质，揭示其表面酸碱性与电化学性能的关系。结果表明：当Mg与Fe的摩尔比(n(Mg)/n(Fe))为3时MgFe-LDH (LDH-3)的结晶度最高，碱性最强，且远强于n(Mg)/n(Fe)为2的MgFe-LDH (LDH-2)和n(Mg)/n(Fe)为4的(LDH-4)的碱性。LDH-2的碱性略强于LDH-4的，但差异微小。层间CO32-与LDH层板金属离子主要形成单齿和双齿配位，其中，单齿配位体与强碱位点配位，形成Lewis碱位。表面碱性取决于Lewis强碱性位(CO32-单齿配位)的含量。用镁铁水滑石煅烧产物(MgFe-LDOs)修饰玻碳电极来研究其电化学性能。碱性越强(如LDO-3)，其氧化还原可逆性及导电性能越好。
이용X사선연사(XRD)、부리협변환홍외광보(FT-IR)、령전하점pHPZC、순배복안(CV)화전화학조항(EIS)등수단，연구미철수활석(MgFe-LDHs)적표면화학성질，게시기표면산감성여전화학성능적관계。결과표명：당Mg여Fe적마이비(n(Mg)/n(Fe))위3시MgFe-LDH (LDH-3)적결정도최고，감성최강，차원강우n(Mg)/n(Fe)위2적MgFe-LDH (LDH-2)화n(Mg)/n(Fe)위4적(LDH-4)적감성。LDH-2적감성략강우LDH-4적，단차이미소。층간CO32-여LDH층판금속리자주요형성단치화쌍치배위，기중，단치배위체여강감위점배위，형성Lewis감위。표면감성취결우Lewis강감성위(CO32-단치배위)적함량。용미철수활석단소산물(MgFe-LDOs)수식파탄전겁래연구기전화학성능。감성월강(여LDO-3)，기양화환원가역성급도전성능월호。
The surface chemical characteristics of the Mg-Fe hydrotalcites (MgFe-LDHs) were determined using X-ray diffractometry (XRD), Fourier transform-infrared spectrometer (FT-IR), point of zero charge (pHPZC), cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The relationship between the surfaceacid-base and electrochemical properties of the MgFe-LDHs was clarified. The results show that the MgFe-LDH with molar ratio of Mg to Fe (n(Mg)/n(Fe)) being 3 (LDH-3) has the highest crystallity structure with symmetrical crystals, indicating that the surface basicity of the LDH-3 is the strongest. And its basicity is much higher than those of ones with n(Mg)/n(Fe) of 2 (LDH-2) and 4 (LDH-4). The basicity of LDH-2 is slightly stronger than that of LDH-4. The monodentate and bidentate coordinations are formed by the interlayer CO32- anions coordinating with the metal ions in the brucite-like layers. The monodentate ligand coordinates with the strong basic sites, then Lewis basic sites form. The basicity depends on the content of Lewis basic sites. Mg-Fe hydrotalcite calcined samples (MgFe-LDOs) were used to modify glassy carbon electrode to study its electrochemical properties. The stronger the basicity (such as those of the LDO-3) is, the better the oxidation-reduction reversibility and conductivity are.